Chemistry
Which of the following equations represents an endothermic reaction?
- C + O2 CO₂
- CaO + H2O → Ca(OH)2
- NaOH + HCl → NaCl + H₂O
- CaCO3 CaO + CO₂
Chemical Reaction
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Answer
CaCO3 CaO + CO₂
Reason — An endothermic reaction is a type of reaction that absorbs heat from the surroundings. This means energy is required to break bonds in the reactants, and the products have more energy than the reactants. The decomposition of calcium carbonate (CaCO₃) into calcium oxide (CaO) and carbon dioxide (CO₂) requires heat to proceed.
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